Teeth



March 22, 1955 G. 'w. JOHANSSON APPARATUS FOR SETTING AND GAUGING SAWTEETH Filed April 27, 1953 bvvsuwe; 6 usra v WI'LJIELM Jot/0115.50;

United States Patent APPARATUS FOR SETTING AND GAUGING SAW TEETH GustavWilhelm Johansson, Saternas, Horrmund, Sweden Application April 27,1953, Serial No. 351,210

Claims priority, application Sweden July 8, 19 52 2 Claims. (Cl. 76-71)The present invention relates to improvements in apparatus for settingsaw teeth, said apparatus comprising a saw setting device and aninstrument secured on the same and provided with a pointer movable overa dial to indicate the set degree, the measuring instrument beingadapted to measure the degree of set in the working position of the sawsetting device.

According to the invention the saw setting device is adapted byengagement with the saw tooth in view to be held automatically in thegiven setting position, and to indicate the degree of set. The advantageof said arrangement over known set devices of this type is among othersthat no incorrect indication of the degree of set may be given onaccount of manual action of the operator.

The accompanying drawing shows an embodiment of the invention.

Fig. 1 is a side view and Fig. 2 an end view seen from the left in Fig.1.

On the saw setting device 1 in known manner pro vided with at least onenotch 2 for engaging a saw tooth 3 there is pivotally connected by meansof a screw bolt 4 a supporting plate 5 that is secured on a measur inginstrument 6. In said instrument 6 there is provided a dial 7 over whicha pointer 8 is movable, one end of said pointer being pivoted on a pin 9secured in the instrument. Furthermore a double armed lever 11 isturnable on a pin secured in the instrument, the longer arm of saidlever being adapted to make contact with the pointer 8, and the shorterarm to engage a notch in one side of a movable finger or pin 12 which isslidably mounted in two opposite walls of the instrument and extendingthrough said walls. The pointer 8 is pressed against the end of thelonger arm of the lever 11 by means of a tension spring 13, one end ofwhich is secured to the pointer 8 and the other end secured to a wall ofthe casing of the instrument 11. Furthermore, one end of a tensionspring 14 is secured to the handle of the setting device, the other endof the said spring being secured to the casing of the instrument.

2,704,469 Patented Mar. 22, 1955 is placed in known manner so that thesaw tooth 3 engages the notch 2, whereupon the setting operation isperformed by turning the saw setting handle upwards (in the presumedcase) as shown by the arrow in Fig. 1. When thereby the tooth 3 is bentto the left, the instrument is moved correspondingly to the left whilethe pin 12 remains stationary, whereby the pin 12 is slid to the rightrelative to the instrument 6, since its left end by action of the spring14 is pressed against the flat base portion of the saw blade. Therebythe longer arm of the lever 11 is turned clockwise and acts upon thepointer 8, so that it is turned counterclockwise against the action ofthe spring 13. The turning of the pointer 8 will, of course, beproportional to the degree of set, which consequently is indicated onthe dial.

What I claim:

1. A combined saw tooth setting and gauging device comprising incombination a handle having a slit near one end thereof to receive a sawtooth to be set, a frame pivotally connected near said slit to saidhandle and spring biassed towards the saw blade and including a dial andpointer means, said frame having at the end remote from the handle ahead operable for engaging the side surface of the saw blade, and a pinslidably mounted in said frame intermediate the handle and head forengaging said side surface of the saw blade, said pin being operativelyconnected to said pointer means within said frame for indicating on saiddial the position of the pin and thereby of the setting.

2. In a combined saw tooth setting and gauging device, in combination, ahandle including means for engaging a tooth to set it angularly of thesaw blade, a gauge comprising a casing having a fixed finger operable tomake contact with the side surface of the saw blade opposite relative tothe direction of tooth setting, said handle being connected to a portionof said casing, resilient means between said portion and said handle andoperable to urge the casing towards said side surface during toothsetting, said gauge having indicating means including a movable fingerextending from said casing adjacent said portion and operable to makecontact with 5 For performing the set operation the saw setting devicesaid side surface at a point spaced from said fixed finger to indicatethe extent of movement of said casing relative to said side surfacethereby indicating the extent of tooth setting made by said handle.

References Cited in the file of this patent UNITED STATES PATENTS1,230,166 Hunger June 19, 1917 1,817,272 Schroeder Aug. 4, 1931 FOREIGNPATENTS 53,619 Sweden Jan. 31, 1923 127,652 Sweden Mar. 14, 1950

